Engine unit

Abstract

An engine unit includes an engine, an exhaust gas treatment device and a connecting pipe. The engine has an exhaust gas port. The exhaust gas treatment device is arranged above the engine. The connecting pipe connects the exhaust gas port and the exhaust gas treatment device. The connecting pipe has an expandable-contractible bellows portion. The bellows portion has a linear form following the upward-downward direction. The lower end portion of the bellows portion is positioned lower than at least a part of the exhaust gas port.

The invention claimed is: 
     
       1. An engine unit comprising:
 an engine having an exhaust gas port; 
 an exhaust gas treatment device arranged above the engine; and 
 a connecting pipe connecting the exhaust gas port and the exhaust gas treatment device, the connecting pipe having an expandable-contractible bellows portion, 
 the bellows portion having a linear form following an upward-downward direction, with a lower end part of the bellows portion being positioned lower than at least a part of the exhaust gas port, 
 the connecting pipe having a first connecting pipe portion connecting the exhaust gas port and the lower end portion of the bellows portion, and 
 the first connecting pipe portion having a form bending from the exhaust gas port toward a downward position lower than the exhaust gas port. 
 
     
     
       2. The engine unit according to  claim 1 , wherein
 an upper end of the bellows portion is positioned higher than a lower end portion of the exhaust gas treatment device. 
 
     
     
       3. The engine unit according to  claim 1 , wherein
 a length of the bellows portion is longer than a distance in the upward-downward direction between a lower end portion of the exhaust gas treatment device and an upper end portion of the exhaust gas port. 
 
     
     
       4. The engine unit according to  claim 1 , further comprising
 a bracket with the exhaust gas treatment device arranged thereon, the first connecting pipe portion having a supporting part supporting the bracket. 
 
     
     
       5. The engine unit according to  claim 1 , wherein
 the exhaust gas treatment device has a cylindrical portion and an end face closing an end of the cylindrical portion in an axial direction of the exhaust gas treatment device, and 
 the connecting pipe connects to the end face of the exhaust gas treatment device. 
 
     
     
       6. The engine unit according to  claim 5 , wherein
 the connecting pipe has a second connecting pipe portion connecting the end face of the exhaust gas treatment device and an upper end portion of the bellows portion, and 
 the second connecting pipe portion is directly mounted on the end face of the exhaust gas treatment device. 
 
     
     
       7. The engine unit according to  claim 1 , wherein
 the bellows portion has a first bellows tube and a second bellows tube, the second bellows tube being a separate body from the first bellows tube, and the second bellows tube being connected to the first bellows tube. 
 
     
     
       8. The engine unit according to  claim 1 , wherein
 the engine has a crankshaft, and 
 the exhaust gas treatment device is arranged such that an axial line of the exhaust gas treatment device follows an axial direction of the crankshaft. 
 
     
     
       9. A working vehicle including the engine unit according to  claim 1 . 
     
     
       10. The working vehicle according to  claim 9 , further comprising:
 an engine room housing the engine unit; and 
 a cab arranged adjacent to the engine room, 
 the engine room having a wall part arranged between the cab and the engine, and 
 the bellows portion being arranged so as to extend in the upward-downward direction following the wall part. 
 
     
     
       11. The working vehicle according to  claim 10 , wherein
 the exhaust gas treatment device comprises a first exhaust gas treatment device; and 
 the working vehicle further includes
 a second exhaust gas treatment device disposed on a side of the first exhaust gas treatment device; 
 a rear end portion of the second exhaust gas treatment device being positioned rearward of a rear end portion of the first exhaust gas treatment device; 
 the wall being positioned rearward of the first exhaust gas treatment device; and 
 the bellows portion being arranged to extend in the upward-downward direction following the wall part in a space between the wall part and the first exhaust gas treatment device.